MASK SYSTEM

摘要

A mask system for use between a patient and device to deliver a breathable gas to the patient includes a mouth cushion, a pair of nasal prongs, an elbow, and a headgear assembly. The mouth cushion is structured to sealingly engage around an exterior of a patient's mouth in use, and the pair of nasal prongs are structured to sealingly communicate with nasal passages of a patient's nose in use. The elbow delivers breathable gas to the patient. The headgear assembly maintains the mouth cushion and the nasal prongs in a desired position on the patient's face. The headgear assembly provides a substantially round crown strap that cups the parietal bone and occipital bone of the patient's head in use.

主权项

1. An elbow assembly for a patient interface configured to deliver positive pressure gas for respiratory therapy to a patient to treat sleep disordered breathing, the elbow assembly comprising:
a main body with a first end, a second end and a bend between the first and second ends, the first end being adapted to connect to the patient interface and the second end being adapted to connect to an air delivery tube; an opening in a wall of the main body; a support member that sealingly covers the wall opening and is securable to the main body; an anti-asphyxia valve (AAV) attached to the support member and including a flap portion; and a port arranged and sized to be closed by the flap portion when the positive pressure gas flows through the main body, from the second end to the first end.